Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13758
> This PR also optimize generate code of projection for an primitive type
array. While we know primitive type array does not require null check and has
contiguous data region, this PR performs bulk data copy by using Platform.copy
without null checks.
if the input array is primitive array, it should in unsafe format and we
will just copy the binary, so what's the use case for this optimization?
Besides, proving a faster `GenericArrayData` is not an optimization for me,
if we don't get an end-to-end performance boost.
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